Ball-grinding machine.



B.-EITNER. BALL GRINDING MACHINE.

APPLICATION FILED AUG. 31, 1909.

977,717; Patented Dec.6,1910.'

2 SHEETS-SHEET l.

C J x I jizaezzzm @7220 B. BITNER. .BALL GRINDING MACHINE. APPLIGATION FILED AUG. 31, 1909.

Patenfied Dec; 6, 1910.

2 SHEETSSHEET 2.

i I Willi/[Mull],

nnn'rnotn EITHER, or BERLIN, GERMANY.

, BALL-demerits acninn I Specification of Letters Patent.

Patented Dec. 6, 1910.,

' Application filed August 31, 1909.. Serial No. 515,388.

To all whom it may concern:

Be it known that I, BERTHOLD EITNER, Work-master, a subject of the King of Prussia, residing at No- 14 Gotzkowskystrasse,

Berlin, in .the Kingdom of Prussia, Ger- 1 many, have invented certain new and useful Improvements relating to Ball-Grinding Machines, of .which the following is a full, clear, and exact description.

The present invention relates to a ball grinding machine having grinding plates formed with annular grooves and the main feature of the machine is that these plates are mounted to operate in a horizontal plane and in order'thoroughly tomix the balls they are positively removed from and returned to one place on the "plate. This positive removal and'return of the balls is necessitated by .the horizontal mounting of the grinding plates as it is only by this means that it is possible to noduce the alteration in the position of the alls, as regards their order and the paths that they follow, which is necessary for thoroughly mixing them.

An embodiment of the invention is illustrated by way of example in the accompanying drawing, in which igure 1 is a side elevation of the grinding machine as a whole. Fig. 2 is a cross section of the means for positively removing and returning the balls. Fig. 3 is a plan corresponding to Fig. 2. Figs. a and 5 are cross sections.

As shown in Fig. 1, the grinding plates a and Z) are superposed and arranged to operate in a horizontal plane. Theemery plate a forms the upper rotary plate, while the grooved metal plate Z) is fixed to the frame or table of the machine. The means 0 for positively removing andreturning the balls for thepurpose of mixing them is combined with this fixed metal plate 72, the essential part of this device consisting of the rotating conveyer plate f arranged in the closed mixing chamber at which plate constitutes the conveyer. on displacing member, for the positive removal and return of the balls. This conveyer plate 7' is arranged in the lower part of the mixing chamber m, and is provided on its outer side with the same number of grooves as the metal plate. It is preferably driven by a cable or cord transmission 8 t directly off the counter shaft to as shown in Fi 1. The halls are supplied to this groove conveyer' plate f through closed tubes or passages d, which directly connect with the grooves in the metal plate I), and thereby constitute an extension there- I of to a certain extent. The balls, which run a at intervals one from the other in the grooves of the plate a and b, in order to preventcontact between them, are forced together in these passages cl, and are forced through the passages by the pressure of the balls which follow them, until they fall over the walls of the mixing chamber m, and reach the periphery of the conveyer plate. Accordmgly in these passages d the balls are always 1 directly under the influence of the displacement impulse which they receive during the actual grinding process between the plates a and b by the rotation of the plate a; under the influence of this displacement impulse, which as already stated, produces the posi-' tive supply to the passages d, the balls then come directly within reach of the conveyer plate f which conveys the balls and delivers them to the return passages g, which connect at the other side with the annular grooves in the metal plate 6.

In the device in accordance with the present invention the groove paths in the plates are never entirely interrupted as in other constructions. The passages d and 9 connect directly with the grooves and thereby constitute an extension thereof in such a manner that the balls both when removed and returned to the grinding plates are given a positive feed from and toward the grooved paths. To this extent the apparatus under the invention differs essentially from machines already referred to in which the balls fall freely from a break in the plates with annular grooves,-as soon as they have left the grindstone.

Owing to the positive removal and return ing plate more freely and uniformly than when the balls fall freely and the more speedy and intense interchange of the balls shortens the operation for the complete grinding of each charge and likewise crmits of increased exactitude'in the grinding.

What I claim as my invention, and desire to secure by Patent is:

1. A ball grinding machine comprising grinding plates formed with annular grooves,

means for operating said plates lIl a horizon-v tal plane, means for mixing the balls at an intermediate period in the grinding opera-- tion, means for positively removing the balls of the balls, it is possible to feed the grind means, and means for positively returning said balls to said rinding plates.

2. A ball grinding machine comprising grinding plates formed with annular grooves, means for operating said plates in a horizontal plane, a mixing chamber for mixing the balls at an intermediate period in the grinding operation; means for positively removing the balls from said rinding plates to said mixing chamber, an means for positively returning said balls to said grinding plates.

3. A ball grinding machine comprising grinding plates formed with annular grooves, means for operating said plates in a horizontal plane, means for mixing the balls at an intermediate period in the grinding operation, means for positively removing the balls from said grinding plates to said mixing means, a conveyer plate having grooves therein for positively returning said. balls to said grinding plate and means for rotating said conveyer plate. i

4. A ball grinding machine comprising grinding plates formed with annular grooves, means for operating said plates in a horizon tal plane, a mixing chamber for mixing the balls at an intermediate period in the grinding operation; means for positively removing the balls from said grinding plates to said mixing chamber, a conveyer plate having grooves therein for positively returning said balls to said grinding plates, and means for rotating said conveyer plate.

A ball grinding machine comprising grind ing plates formed wlth'annu lar grooves,

means for operating said plates in a horizontal plane, means tor mixing the balls at an intermediate period in the grinding'opera lion, means connecting said mixing means with said grinding plates, means for positively removing the balls from said grinding lates to said mixing chamber, and means or ositively returning said balls to said grin in plates.

6. A all grinding machine comprising plates formed with annular grooves, means for operating said plates in a horizontal plane, a mixing chamber for mixing the balls at an intermediate period. in the grinding operation; means for positively removing the balls from said grii'iding plates to said mixing chamber, a channeled part eonneeting the mixing chamber With the grooves in the grinding plates, a conveyor plate having grooves therein for positivelyreturning said balls to said grinding plates and means for rotating said eonveyer plate.

7. A ball grinding machine comprising grinding plates formed with arm niar grooves, means For operating said plates in a horizon tal plane, a mixing chamber for mixing the balls at an intermediate period in the grinding operation; means for positively removing the balls from said grinding plates to said mixing chamber,'a channeled part connecting the mixing chamber with the grooves in the grinding plates, a conveyor plate having grooves therein for positively returning said balls to said grinding plates, means for rotating said conveyer plate and passages connecting the grooves in the conveyor plate with thegrooves in the grii'iding plate.

In witness whereof, I have here unto my name in the presence of two snbseri,

Witnesses. 7

BERTHOLD EITNER.

Witnesses ROBEII'I Mioi'nnsnv, VULDF. M an ll .wr'r. 

